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- W897367143 abstract "Reddening-free indices represent a powerful, and yet little used, approach to problems where reddening/extinction constitute a serious issue, without having to deal with the extinction of any individual star. Here we report on our progress in obtaining reddeningfree indices, in the VISTA filter system. Reddening-free indices are suitable, linear combinations of colors and magnitudes, so that the resulting “pseudo-magnitudes” and “pseudo-colors” are, by construction, insensitive to reddening. Such indices have a long history, and are perhaps most frequently used to derive distances to extragalactic Cepheids, by means of the so-called “Wesenheit indices” (e.g., Madore & Freedman 1991; Ngeow 2012; Inno et al. 2013, and references therein). The Vista Variables in the Via Lactea (VVV) ESO Public Survey (Minniti et al. 2010; Catelan et al. 2011, 2013; Saito et al. 2012) is a variability survey of the Galactic bulge and inner disk, using the Visible and Infrared Survey Telescope for Astronomy (VISTA) 4.1m telescope, and which includes the photometric bands ZY JHKS . Many of the fields that are covered by VVV are subject to very large extinction levels, and thus the availability of reddening-free indices using the VISTA filter system could prove of great help for numerous scientific applications using the VVV data. Consider a set of N photometric bandpasses, and the corresponding magnitudes m1...N . Using the latter, it can be easily shown that a pseudo-magnitude" @default.
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- W897367143 date "2014-10-01" @default.
- W897367143 modified "2023-10-16" @default.
- W897367143 title "Reddening-Free Indices in the VISTA Filter System" @default.
- W897367143 hasPublicationYear "2014" @default.
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